python 单线程实现并发

单线程下支持并发(服务端)：

 from gevent import spawn,monkey;monkey.patch_all()
 from socket import *  

 def server(ip,port):
     server = socket(AF_INET, SOCK_STREAM)
     server.bind((ip,port))
     server.listen(5)  

     while True:
         conn, addr = server.accept()
         print(addr)
         # ....
         # t=Thread(target=talk,args=(conn,add))
         # t.start()
         spawn(talk,conn,addr)  

 def talk(conn,addr):
     while True:
         try:
             data=conn.recv(1024)
             if not data:break
             conn.send(data.upper())
         except ConnectionResetError:
             break
     conn.close()  

 if __name__ == '__main__':
     server('127.0.0.1',8080) 

单线程下实现并发(客户端)：

 from socket import *
 client = socket(AF_INET, SOCK_STREAM)
 client.connect(('127.0.0.1',8080))  

 while True:
     client.send('hello'.encode('utf-8'))
     data=client.recv(1024)
     print(data.decode('utf-8'))